<template>
  <div class="msite">
    <!--首页头部-->
    <header-top :title="address.name" style="cursor: pointer;">
      <router-link class="header_search" slot="search" to="/search">
        <i class="iconfont icon-sousuo"></i>
      </router-link>
      <router-link class="header_login" slot="login" :to="userInfo._id?'/userinfo':'/login'">
        <span class="header_login_text" v-if="!userInfo._id">登录|注册</span>
        <span class="header_login_text " v-else>
          <i class="iconfont icon-person"></i>
        </span>
      </router-link>
    </header-top>

    <!--首页导航-->
    <nav class="msite_nav border-1px">
      <div class="swiper-container" v-if="categorys.length">
        <div class="swiper-wrapper">
          <div class="swiper-slide" v-for="(categorys, index) in categorysArr" :key="index">
            <a href="javascript:" class="link_to_food" v-for="(category, index) in categorys" :key="index">
              <div class="food_container">
                <img :src="baseImageUrl+category.image_url">
              </div>
              <span>{{category.title}}</span>
            </a>
          </div>
        </div>
        <!-- Add Pagination -->
        <div class="swiper-pagination"></div>
      </div>
      <img src="./images/msite_back.svg" alt="back" v-else/>
    </nav>

    <!--首页附近商家-->
    <div class="msite_shop_list border-1px">
      <div class="shop_header">
        <i class="iconfont icon-xuanxiang"></i>
        <span class="shop_header_title">附近商家</span>
      </div>
      <shop-list/>
    </div>

  </div>
</template>

<script>
  import {mapState} from 'vuex'
  import Swiper from 'swiper'
  import 'swiper/dist/css/swiper.min.css'
  import HeaderTop from '../../components/HeaderTop/HeaderTop'
  import ShopList from '../../components/ShopList/ShopList'

  export default {
    name: "MSite",
    methods: {},
    components: {HeaderTop, ShopList},
    data() {
      return {
        baseImageUrl: 'https://fuss10.elemecdn.com'
      }
    },
    mounted() {
      // 获取商品分类数组信息
      this.$store.dispatch('getCategorys');
      // 获取商家列表信息
      this.$store.dispatch('getShops');
    },
    computed: {
      ...mapState(['address', 'categorys','userInfo']),

      // 根据categorys一维数组生成一个二维数组，小数组中的元素个数最大是8
      categorysArr() {
        const {categorys} = this;
        // 准备一个空的二维数组
        const arr = [];
        // 准备一个小数组（最大长度为8）
        let minArr = [];
        categorys.forEach(item => {
          // 如果当前小数组已经满了，创建一个新的
          if (minArr.length === 8) {
            minArr = [];
          }
          // 如果minArr是空的，将小数组保存到大数组
          if (minArr.length === 0) {
            arr.push(minArr);
          }
          // 将当前分类保存到小数组中
          minArr.push(item);
        });
        return arr;
      }
    },
    watch: {
      categorys(value) {
        // 将回调延迟到下次 DOM 更新循环之后执行
        this.$nextTick(() => {
          new Swiper('.swiper-container', {
            pagination: {
              el: '.swiper-pagination',
            },
            loop: true
          })
        })
      }
    }
  }
</script>

<style scoped lang="stylus" ref="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .msite
    width 100%
    .header
      background-color #02a774
      position fixed
      z-index 100
      left 0
      top 0
      width 100%
      height 45px
      .header_search
        position absolute
        left 15px
        top 50%
        transform translateY(-50%)
        width 10%
        height 50%
        .icon-sousuo
          font-size 25px
          color #fff
      .header_title
        position absolute
        top 50%
        left 50%
        transform translate(-50%, -50%)
        width 50%
        color #fff
        text-align center
        .header_title_text
          font-size 20px
          color #fff
          display block
      .header_login
        font-size 14px
        color #fff
        position absolute
        right 15px
        top 50%
        transform translateY(-50%)
        .header_login_text
          color #fff
    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff
      .swiper-container
        width 100%
        height 100%
        .swiper-wrapper
          width 100%
          height 100%
          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap
            .link_to_food
              width 25%
              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0
                img
                  display inline-block
                  width 50px
                  height 50px
              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666
        .swiper-pagination
          > span.swiper-pagination-bullet-active
            background #02a774
    .msite_shop_list
      top-border-1px(#e4e4e4)
      margin-top 10px
      background #fff
      .shop_header
        padding 10px 10px 0 10px
        .shop_icon
          margin-left 5px
          color #999
        .shop_header_title
          color #999
          font-size 14px
          line-height 20px
</style>
